Fix contact -> concat docblock.

Author: loganhenson

src/Lib/Strings.php

@@ -5,7 +5,7 @@
 use Vector\Core\Module;
 
 /**
- * @method static string contact(...$args)
+ * @method static string concat(...$args)
  * @method static array split(...$args)
  * @method static string startsWith(...$args)
  * @method static string toLowercase(...$args)